Both use extroverted feeling, which adapts to their environment, reflects the emotional mood around them, and is seen in outward expressiveness and enthusiasm for topics they care about. Each has some level of concern for humanity (based on their level of active Fe-usage, you can find cold ENTPs and warm INTPs, so don’t assume one or the other is extroverted or introverted based on how much they “care”). An ENTP can seem introverted if they withdraw emotionally to process new information; an INTP can seem extroverted in familiar surroundings. Both are going to be a sentimental and practical – but the INTP more so than the ENTP, because the INTP’s Ne bounces off their Si (detailed information, past experience comparison, practicality), whereas the ENTP’s Si is their least-used function